Doweling jig



Patented Jan. 22', 1952 UNITED STATES PATENT OFFICE DOWELING JIG Frederick A. Volz, New Britain, Conn., assignor to The Stanley Works, New Britain, Conn., a corporation of Connecticut Application February 11, 1947, Serial No. 727,896 Y 1 Claim.

The present invention relates to woodworking tools and, more particularly, to a jig adapted to be used for guiding' the bits of boring tools. the same having particular utility for facilitating the boring of dowel holes. f

It is a general object of the present invention to provide a doweling jig which can be accurately andV easily positioned on a work piece, such as a piece of wood, for guiding the bits of boring tools so'that a hole may be accurately bored in the work piece at a selected position with a minimum of time and effort.

It is a more specific object of the invention to provide a doweling jig of the character described which is simple in operation and design and which can readily be positioned, i. e., set or adjusted, on the work piece without the need for supplementary tools or measuring instruments to accurately guide the boring tool for making a desired boring at a predetermined or selected position.

A further object of the invention is to provide a doweling jig which can be utilized'with a wide variety of sizes of work pieces and may be utilized as a guide rfor a wide range of bits, all with the same facility and ease of positioning.

Another object of the invention is to provide a doweling jig of the character described which may be positioned on a work piece with reference to a positioning mark either on the surface to be bored or on an adjacent surface, or both, this being accomplished in a simple and accurate manner without duplication of any of the elements ofthe jig.

Other objects will be in part obvious `and in part pointed out more in detail hereinafter.

The invention accordingly consists in the features of construction, combination of elements and arrangement of parts which will be exemplifled in the construction hereafter set forth and the scope of the application of which will be indicated in the appended claims.

In the drawing:

Figure l is a top view of a doweling jig constructed in accordance with the invention and mounted on a work piece comprising a piece of wood;

Fig. 2 is a cross sectional view taken along the line 2--2 of Fig. 1; and

Fig. 3 is a cross sectional view taken along the line 3--3 of Fig. 1. Y

Referring to the drawing, the reference lette A denotes a specic doweling jig constructed and assembled in accordance with the inventionand which is shown mountedon a block of wood B in position for guiding the bit of a boring tool (not shown). to demonstrate the manner in which the `jig is utilized.

rihe doweling jig A comprises a frame member I formed with a pair of spaced apart legs II and I2, the undersides of which are substantially iat so as to rest squarely upon the surface of the `wood block B which is to be bored and providing an open space I3 therebetween to receive the bit of the boring tool with which the wood block B is to be bored.

One end of the frame I0 is provided with a downwardly extending flange I4 having an inner surface substantially .at right angles to the undersurfaces `of the legs II and I2 of the frame Ill. The lopposite end of the frame Ill is provided with a downwardly extending lug I5 which threadably receives the threaded rod I6 having a rotatably mounted washer I1 at one end and having at the other end a longitudinally slidable handle I8 by means of which turning leverage may be applied to the rod I6.

As will be apparent, positioning the jig A on the block of wood B is accomplished by placing the frame I0 and ange I4 in engagement with two adjoining sides of the work piece with the spaced legs II and I2 straddling the portion of the work piece to be bored, and then the threaded rod I6 is turned by means of the handle Iovso that the washer I1 is forced against the work piece B opposite from the flange I4 thereby securely clamping the jig to the block of wood.

In accordance with the invention, the inner edges .ofl the spacedlegs Il and I2 are curved or extended inwardly at I9 and 20, respectively, adjacent the flange I4 so as to provide a narrower work piece engaging surface adjacent the flange I4 whereby the jig may be utilized with very thin piecesof wood which otherwise would freely pass between Vthe spaced legs II and I2 of the frame Ill., vIt has been realized, in accordance with the invention, `that with such thin pieces it is not feasible to use bits of very large size, hence the spacing between the legs Il and I2 may be materially reduced at this point without detracting fromthe general utility of the device.

The upper edge of the flange I4 between the curved extensions I9 and 20 is slightly depressed at 2|' so that the upper surface thereof is positioned slightly below the upper surface of the Woodblock B which is to be bored, thus uncovering the upper Aedge of the adjacent surface of the wood .block B. 'I'he depressed area 2| is marked as,for example, by a shallow notch 22, to

denotethe center of the jig. that is to say, the

3 center of the bit guide 34 to be described more particularly hereinafter.

By reason of the shallow depression at 2l on the flange I4, it is possible to accurately position the jig on a block of wood which is marked by a line either on the upper surface of the block of wood which is to be bored or on the side of the block of wood against which the flange I4 engages, or both. The depression 2| is of sufcient depth to permit alignment of the notch or mark 22 with the extremity of a line on the side of the Wood block adjacent the flange I4, but. because of the shallowness of this depression, it is possible also to accurately align the mark or notch 22 with a positioning line on the upper surface of the wood block. As a result of this construction, the operator is given a choice in forming the positioning lines on the work piece and frequently this avoids the necessity for extra markings.

The spaced legs II and I2 of the frame I0 are ribbed at 23 and 24, respectively, for added strength and the rib 24 is provided with a longitudinal groove or guideway 25 for slidably receiving a projecting rib or tongue 26 formed on the slide 21. The rib 24 also is formed with a longitudinal slot 28 cooperating with the guideway 25 and of somewhat smaller dimensions than the guideway for receiving a thumb screw 29 which is threadably received in the slide 21. The bearing surfaces of the rib 24 and slide 21 are substantially flat so that the two may be rigidly clamped together by turning the thumb screw 29 causing washer 30 to engage the outer edges of the slot 28.

The slide 21 is provided at one end with an outwardly extending lug 3I for threadably receiving the set screw 32 and at the other end with an angularly shaped extension 33 adapted to selectively receive a cylindrical bit guide 34. The bit guide 34 is placed in the crotch of the angular extension 33 and is securely held therein by turning the set screw 32.

The cylindrical bit guides 34, in accordance with the invention, are provided in a variety of sizes to t the sizes of the bits (not shown) which it is proposed to use in the doweling operations for which the jig is utilized. These cylindrical bit guides are provided with indicia, such as the numeral shown in dot and rdash lines in Fig. 3, for denoting the size thereof and, of course, the size of the, bit which is adapted to be used therewith.

The upper surface of the rib 24 is flattened'and provided with indicia or markings 35 for `measuring the distance of the slide 21 from the inner surface of the flange I4. For convenience, as shown in the drawing, such markings may represent inches and fractions thereof or any similar units of measurement. The adjacent upper surface of the slide 21 also is provided with indicia or markings 36 adapted to be aligned with the indica or markings 35 of the rib 24, said indicia or markings 36 corresponding to the center lines of the various bit guides 34 with which the doweling jig is provided. It will be apparent that, as larger bit guides 34 are inserted into vthe crotch of the angular extension 33, the center of the drill placed therein is moved a corresponding `greater distance from the inner surface of the flange I4. By setting the indicia or marking on the slide 21 corresponding to the particular .guide 34 selected in alignment with the indicia or mark'- ing 35 provided on the rib 24 which is at the desred distance from the flange I4, the operator 4 is assured that the hole will be bored at exactly the desired position in the work piece.

The operation of the doweling jig will be apparent from the above description taken in connection with the following explanation. A line is drawn on the block of wood B either on the surface to be bored or on one of the adjacent side surfaces to indicate the desired transverse center line of the bit. The frame I0'is then clamped on the block of wood by turning the rod I6 after aligning the mark or notch 22 with either line on the block of wood and with the legs II and I2 straddling the portion of the work piece to be bored. A bit guide 34 of the size required for the bit which it is desired to use is then selected and clamped in the angular extension 33 of the slide 21 by turning the set screw 32. The slide 21 is then slid along the guideway 25 until the mark or indicia corresponding to the bit guide 34 selected is aligned with the indicia or marking on the rib 24 which is at the desired measured distance from the flange I4. The slide 21 is then clamped in this selected position by turning the thumb screw 29. The jig is then in position for use as a guiding tool and the desired hole may be bored by inserting the bit of a cutting tool (not shown) into the bit guide 34 and turning same. The jig may then be removed and moved to a new position or, if desired, additional holes may be bored at the same setting merely by moving the slide 21 to the desired new position.

It thus will be seen that there has been provided, in accordance with the invention, a jig which is of simple construction and which is particularly adapted to facilitate the boring of holes for doweling purposes in that the device is easily and quickly manipulated, can be properly set for a wide variety of sizes of bits in an uncomplicated and convenient manner, and can be properly positioned on the work piece with accuracy in what is essentially a simple operation.

As many changes could be'made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall'be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the language used in the following claim is intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

I claim as my invention:

In a doweling jig of the type having a frame constructed to overlie a workpiece and provided with a downwardly extending ilange at one end for engaging one side of the workpiece, manuale ly adjustable means at the other end of the frame for engaging the opposite side of the workpiece, a slide having a V-shaped seat for receiving a cylindrical bit guide and mounted for sliding movement on the frame to move the apex of the seat in va path perpendicular to the flange, means for selectively securing cylindrical bit guides of varying diameter in said seat, and means for securing the slide in selected position relative to the flange of the frame, a pair of cooperating scales rendering the slide quickly and easily settable consisting of a rst upwardly facing and easily visible scale on 'the frame at right angles to the flange and consisting of markings at measured distances lfrom the flange and a second fupwardly Jfacing and easily visible scale on the slide in sideby side relation with the rst scale l center line.

FREDERICK A. VOLZ.

REFERENCES CITED The following references are of record in the ie of this patent:

UNITED STATES PATENTS Number Name Date Coyle May 4, 1897 Corliss Aug'. 5, 1902 Lovett Jan. 2, 1906 Roberts Apr. 6, 1909 Kelley Nov. 23, 1915 Heritage June 8, 1918 Coutrastano Oct. 14, 1947 

